Frame Z & Trans tunnel question

[timeless_kris]

Hey fellow members, I've been lurking on the forum for a while now trying to gather as much info as I can on bagging my '81 swb stepside. I've come to the conclusion that I'm going to do a 1.5"z along with roughly a 1" crossmember pancake. I was wondering if anyone can confirm if you need to raise your trans tunnel/Install a 4wd trans hump for a 1.5"z (trans is 4l60e), I've seen a few threads touch base on this subject but no definitive answers. Any input would be appreciated. Hoping to get started this weekend, if anyone has any helpful info on z'ing in general feel free to share.